JP4313164B2 - Pile head joint structure - Google Patents

Pile head joint structure Download PDF

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JP4313164B2
JP4313164B2 JP2003396109A JP2003396109A JP4313164B2 JP 4313164 B2 JP4313164 B2 JP 4313164B2 JP 2003396109 A JP2003396109 A JP 2003396109A JP 2003396109 A JP2003396109 A JP 2003396109A JP 4313164 B2 JP4313164 B2 JP 4313164B2
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pile
pile head
joint
upper structure
head
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JP2005155201A (en
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一雅 菅
正博 井上
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Japan Pile Corp
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Japan Pile Corp
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Description

本願発明は、基礎杭の杭頭部とフーチングや基礎スラブ、地中梁などの上部構造体下部との接合部である杭頭接合部の構造に関するものである。   The present invention relates to a structure of a pile head joint that is a joint between a pile head of a foundation pile and a lower portion of an upper structure such as a footing, a foundation slab, or an underground beam.

基礎杭の杭頭部と上部構造体との接合部である杭頭接合構造としては、従来、杭頭部から上方にアンカー筋を突出させ、杭頭部をアンカー筋とともにフーチング基礎などの鉄筋コンクリート中に埋め込むのが一般的である。   Conventionally, as the pile head joint structure, which is the joint between the pile head of the foundation pile and the upper structure, the anchor bar protrudes upward from the pile head, and the pile head together with the anchor bar is used in reinforced concrete such as a footing foundation. It is common to embed in.

しかし、その場合、杭頭部が剛に近い高い固定度となるため、大きな地震が作用すると過大なせん断力や曲げモーメントにより杭頭部が破壊される恐れがある。   However, in that case, the pile head has a high degree of fixation close to rigidity, and therefore a pile head may be destroyed by an excessive shear force or bending moment when a large earthquake acts.

この問題に対し、杭頭部の固定度を低くすることで、地震等による杭頭部の破損を防止する構造が種々提案されている。   In response to this problem, various structures have been proposed that prevent the pile head from being damaged by an earthquake or the like by reducing the fixing degree of the pile head.

例えば、特許文献１には、図６に示すように、杭２２の頭部と上部構造物２１の下面との間に摩擦材２６を介在させるとともに、杭頭部を貫通させる管状の水平力抵抗部材２３を設けることで、大きな地震に遭遇した場合には、水平力抵抗部材２３の制約の範囲で上部構造物２１が杭頭部に対して水平移動できるようにし、杭頭部で上部構造物２１の鉛直荷重を支持しつつ、杭頭部に過大なせん断力や曲げモーメントが作用しないようにした杭頭構造が記載されている。 For example, in Patent Document 1, as shown in FIG. 6 , a tubular horizontal force resistance that allows the friction material 26 to be interposed between the head of the pile 22 and the lower surface of the upper structure 21 and penetrates the pile head. By providing the member 23, when a large earthquake is encountered, the upper structure 21 can be moved horizontally with respect to the pile head within the limits of the horizontal force resistance member 23. A pile head structure is described in which an excessive shear force and bending moment are not applied to the pile head while supporting a vertical load of 21.

なお、特許文献１では、上部構造物２１のロッキングに対しては、杭２２の頭部と上部構造物２１の摩擦材２６との間に免震用積層ゴムを介在させることも提案されている。   In addition, in patent document 1, with respect to the rocking | locking of the upper structure 21, it is also proposed to interpose a laminated rubber for seismic isolation between the head of the pile 22 and the friction material 26 of the upper structure 21. .

また、特許文献２には、図７に示すように、フーチング３２と杭頭部３１との間にゴム板などによる緩衝部３３を設け、杭頭部３１を回転可能とした杭頭接合部が記載されている。その他、杭頭部３１の中心から突出してフーチング３２に定着される鉄筋を設け、引抜き力に抵抗させることも記載されている。 Further, in Patent Document 2, as shown in FIG. 7 , there is provided a pile head joint portion provided with a buffer portion 33 by a rubber plate or the like between the footing 32 and the pile head portion 31 so that the pile head portion 31 can be rotated. Are listed. In addition, it also describes that a reinforcing bar that protrudes from the center of the pile head 31 and is fixed to the footing 32 is provided to resist the pulling force.

特許文献３は、本願出願人に係るものであり、杭頭部にバンド状の接合具を利用して杭頭アンカー筋を取り付ける構造が記載されている。
特開２０００−１２００７９号公報 特開２００２−００４２９９号公報 特開２００２−１４６７８１号公報 Patent Document 3 relates to the applicant of the present application, and describes a structure in which a pile head anchor bar is attached to a pile head using a band-shaped connector.
JP 2000-120079 JP 2002-004299 A JP 2002-146781 A

杭頭部の固定度を低減するための、図６や図７の構造では、杭頭部とフーチング部との間で縁が切れていることで、地震時に発生する杭鉛直方向の引き抜き力が杭に伝達されず、上部建物の浮き上がりや転倒の可能性がある。 In the structure of FIG . 6 and FIG. 7 for reducing the fixing degree of the pile head, the pulling force in the vertical direction of the pile generated at the time of the earthquake is reduced because the edge is cut between the pile head and the footing part. There is a possibility that the upper building will be lifted or toppled without being transmitted to the pile.

上部建物の転倒に対し、特許文献１では免震用積層ゴムを介在させることも示唆されているが、積層ゴムは一般的には水平方向の変位を対象としており、鉛直方向の変形は鋼板を挟んで積層された薄肉のゴムの弾性範囲内に限定されるため、浮き上がりが生ずるような大地震にはほとんど効果がなく、実用的でない。   Patent Document 1 suggests that a laminated rubber for seismic isolation is interposed for the overturning of the upper building, but laminated rubber is generally intended for horizontal displacement, and vertical deformation is caused by a steel plate. Since it is limited within the elastic range of the thin rubber laminated, it has little effect on a large earthquake that causes lift and is not practical.

また、特許文献２では杭頭部から突出させた鉄筋をフーチング内に定着させることが示唆されているが、特許文献２記載の発明は杭頭部の回転を許容する構造であるため、仮に鉄筋を用いるとすると鉄筋を杭頭部の中心に設ける必要があり、かつ断面中心に位置する鉄筋により杭頭部とフーチングとの間での相対移動が拘束されて固定度が上がるので、本来的な効果である緩衝部の効果が損なわれてしまう。   Patent Document 2 suggests that the reinforcing bar protruded from the pile head is fixed in the footing. However, since the invention described in Patent Document 2 is a structure that allows rotation of the pile head, the reinforcing bar is temporarily assumed. Is necessary to provide a rebar at the center of the pile head, and the relative movement between the pile head and the footing is restricted by the rebar located at the center of the cross section, which increases the fixing degree. The effect of the buffer part which is an effect will be impaired.

このように、従来の低固定度の杭頭接合構造において、引抜き力や転倒モーメントに対処する必要性は認識されているものの、低固定度と引抜き抵抗の両者を満足させるのは困難であり、実用的な構造が得られていないのが現状である。   In this way, in the conventional low-fixed pile head joint structure, it is recognized that it is necessary to deal with the pulling force and overturning moment, but it is difficult to satisfy both the low fixed degree and the pulling resistance. At present, no practical structure has been obtained.

本願発明は、上述のような課題の解決を図ったものであり、杭頭接合部において、杭頭固定度を低減するとともに、鉛直方向の引抜き力を杭に効果的に伝達させることができる杭頭接合構造を提供することを目的としている。   The invention of the present application is intended to solve the problems as described above, and at the pile head joint, the pile head fixing degree can be reduced, and the vertical pull-out force can be effectively transmitted to the pile. It aims to provide a head joint structure.

本願の請求項１に係る発明は、基礎杭としての節杭の杭頭部と上部構造体との接合構造において、前記上部構造体を支持する基礎杭の杭頭部と上部構造体とを、該杭頭部の上面と上部構造体の下面との間に縁切用のプレートを介在させることで、水平方向に相対移動可能とし、かつ前記杭頭部の外周部である節部の直下の外周面に、あらかじめ周方向に複数本のアンカー筋を取り付けたバンド状接合具を締め付け固定し、該バンド状接合具に取り付けられた複数本のアンカー筋の先端部を、前記縁切用のプレートを貫通させて、前記上部構造体のコンクリート中に定着させてあることを特徴とするものである。 The invention according to a first aspect of the present invention, in the bonding structure between pile head and the upper structure of Fushikui as foundation piles, the pile head and the upper structure of the foundation pile for supporting the upper structure, By interposing a plate for edge cutting between the upper surface of the pile head and the lower surface of the upper structure, the plate can be relatively moved in the horizontal direction, and directly below the node that is the outer periphery of the pile head . A band-shaped connector having a plurality of anchor bars attached in advance in the circumferential direction is fastened and fixed to the outer peripheral surface, and the distal ends of the plurality of anchor bars mounted on the band-shaped connector are connected to the edge cutting plate. And is fixed in the concrete of the superstructure.

ここでいう、上部構造体とは、基礎杭に支持されるフーチングなどの建物基礎部を含めた建物、その他の構造物の一部または全体を指す。   Here, the upper structure refers to a part or the whole of a building including a building foundation such as a footing supported by a foundation pile and other structures.

杭頭部で上部構造体の鉛直荷重を支持しつつ、水平方向に相対移動可能とするためには、杭頭部と上部構造体との間の縁を切り、かつこれらの当接面の摩擦係数ができるだけ低くなるようにするか、あるいは杭頭部と上部構造体との間に水平方向の変形量の大きい変形部材を介在させることなどが考えられる。   To support the vertical load of the upper structure at the pile head and to enable relative movement in the horizontal direction, the edge between the pile head and the upper structure is cut, and the friction between these contact surfaces It is conceivable to make the coefficient as low as possible, or to interpose a deformable member having a large amount of deformation in the horizontal direction between the pile head and the upper structure.

請求項１に係る発明は、その具体的な形態として、縁切用のプレートを介在させる場合を限定したものである。 The invention according to 請 Motomeko 1 has as its specific form, is obtained by limiting the case of interposing the plate rim switching.

一方、アンカー筋については、前述した本願出願による特許文献３記載の発明のように、杭頭部の外周部に固定した接合具に取り付けられた複数本のアンカー筋の先端部を上部構造体のコンクリート中に定着させる。   On the other hand, as for the anchor bars, as in the invention described in Patent Document 3 according to the above-mentioned application of the present application, the distal ends of the plurality of anchor bars attached to the joint fixed to the outer peripheral part of the pile head are used as the upper structure. Fix in concrete.

この場合、既成杭に対し、杭頭部のアンカー筋を後から簡単に取り付けることができ、かつアンカー筋の上部構造体への定着の構造は従来の剛な杭頭接合構造の場合と同様の配置が可能であるため、上部構造体からの転倒モーメント、引抜き力は、アンカー筋を介して確実に杭に伝達され、上部構造体の浮き上がりを抑制することができる。   In this case, the anchor bar of the pile head can be easily attached to the existing pile, and the anchoring structure of the anchor bar to the upper structure is the same as that of the conventional rigid pile head joint structure. Since the arrangement is possible, the overturning moment and the pulling force from the upper structure are reliably transmitted to the pile via the anchor bars, and the lifting of the upper structure can be suppressed.

また、杭頭部の外周部に固定したアンカー筋の上部構造体に埋設されている部分以外はフリーな状態にあり、大きな地震などによる杭頭部と上部構造体との水平方向の相対移動に対しては実質的に抵抗しない。すなわち、アンカー筋としての鉄筋あるいはＰＣ鋼材は、水平方向への剛性は小さいため、水平力への固定度に影響を与えることなく、引き抜き力を伝達することができる。   In addition, the part other than the part embedded in the upper structure of the anchor reinforcement fixed to the outer periphery of the pile head is in a free state, and the horizontal movement between the pile head and the upper structure due to a large earthquake etc. It does not resist substantially. That is, since the reinforcing bar or PC steel material as the anchor bar has a small rigidity in the horizontal direction, the pulling force can be transmitted without affecting the fixing degree to the horizontal force.

なお、この部分については、通常、杭頭部の土砂の埋め戻しによりアンカー筋の下部が土砂等に埋まった状態となるが、発泡樹脂その他任意の埋め戻し材料の利用が可能である。   In addition, about this part, although the lower part of an anchor reinforcement will be in the state normally buried in earth and sand etc. by the backfilling of the earth and sand of a pile head, utilization of foaming resin and other backfilling materials is possible.

アンカー筋や接合具については、防錆処理等を十分行っておくことが望ましい。また、アンカー筋として、炭素繊維、アラミド繊維等の連続繊維を束ねた補強体などを用いてもよい。   It is desirable that the anchor bars and joints are sufficiently subjected to rust prevention treatment or the like. Moreover, you may use the reinforcement etc. which bundled continuous fibers, such as a carbon fiber and an aramid fiber, as an anchor reinforcement.

本願発明の杭頭接合構造において、接合具としては、杭頭部の外周面に締め付け固定されるバンド状の接合具を用いる。 Te pile joint structure odor of the present invention, the contact Gogu, a band-shaped connectors which are fastened to the outer peripheral surface of the pile head.

このバンド状の接合具としては、前述した本願出願人による特許文献３に記載されているように、例えばリングを２分割した形状のバンド状接合具を杭頭部の外周面から突き合わせ、端部どうしをボルトなどで締め付ける構造がある。また、本願発明では、このバンド状接合具を節部の直下で固定するため、引抜き力に対し節部による抵抗も得られる。 As this band-shaped connector, as described in Patent Document 3 by the applicant of the present application described above, for example, a band-shaped connector having a shape obtained by dividing the ring into two is abutted from the outer peripheral surface of the pile head, and the end portion There is a structure that tightens bolts together. Further, in the present invention, order to secure the band-shaped connectors just below knuckles, Ru resistance obtained by the knuckles to withdrawal force.

縁切用のプレートとしては、鋼板などを用いることができるが、摩擦係数を低減するため、フッ素樹脂加工を施したプレート等を用いることもできる。また、間に低摩擦材料を介在させることも可能である。 As the edge cutting plate, a steel plate or the like can be used, but in order to reduce the friction coefficient, a plate or the like subjected to fluororesin processing can also be used. It is also possible to interpose a low friction material between them.

また、この請求項１に係る杭頭接合構造において、複数本のアンカー筋は縁切用のプレートを貫通している。 Further, pile head joint structure odor according to the claim 1 Te, several of Anchors double is that not penetrate the plate rim switching.

縁切用のプレートの径は、設計等において想定される杭頭部と上部構造物の水平方向の相対移動の距離などに応じて決めることができるが、アンカー筋を縁切用のプレートを貫通させて配置する場合、上部構造物のフーチングなどのコンクリートの打設において、あらかじめプレートに複数のアンカー筋を貫通させた状態でコンクリートを打設するようにすれば、双方が互いの位置決め材として機能し、施工が容易となる。 The diameter of the edge cutting plate can be determined according to the distance of horizontal relative movement between the pile head and the superstructure assumed in the design, etc., but the anchor bars penetrate the edge cutting plate. When placing concrete, such as footing of superstructure footing, if concrete is placed with a plurality of anchor bars penetrating the plate in advance, both function as positioning materials for each other. and, construction is that easy and Do not.

請求項２は、請求項１に係る杭頭接合構造において、前記複数本のアンカー筋の前記縁切用のプレートの貫通位置を、前記節杭の節部の外周位置より外側としてある場合を限定したものである。In the pile head joint structure according to claim 1, the case where the penetration position of the edge cutting plate of the plurality of anchor bars is outside the outer peripheral position of the joint portion of the joint pile is limited. It is a thing.

本願の請求項３に係る発明は、基礎杭としての節杭の杭頭部と上部構造体との接合構造において、前記上部構造体を支持する基礎杭の杭頭部と上部構造体とを、該杭頭部の上面と上部構造体の下面との間に免震支承を介在させることで、水平方向に相対移動可能とし、かつ前記杭頭部の外周部である節部の直下の外周面に、あらかじめ周方向に複数本のアンカー筋を取り付けたバンド状接合具を締め付け固定し、該バンド状接合具に取り付けられた複数本のアンカー筋の先端部を、前記上部構造体のコンクリート中に定着させてあることを特徴とするものである。 In the invention according to claim 3 of the present application, in the joint structure between the pile head and the upper structure of the joint pile as the foundation pile, the pile head and the upper structure of the foundation pile that supports the upper structure, periphery just below at Rukoto is interposed seismic isolation bearings, and relatively movable in the horizontal direction, and node portions is an outer peripheral portion of the pile head to the lower surface of the upper structure of the pile head A band-shaped connector having a plurality of anchor bars attached in advance in the circumferential direction to the surface is fastened and fixed, and the tip ends of the plurality of anchor bars mounted on the band-shaped connector are placed in the concrete of the upper structure. It is characterized in that it is fixed on.

上部構造体を杭頭部に対し水平方向に相対移動可能に支持する方法としては、積層ゴムなどの免震支承を介在させて支持する方法がある。背景技術の項で述べた特許文献１には積層ゴムにより引抜き力に抵抗することが示唆されているが、本願の請求項３に係る発明においては、引抜き力には杭頭部の外周に固定されるアンカー筋が抵抗する構造となっており、積層ゴムに無理な引抜き力が作用することはない。 As a method for supporting the upper structure so as to be relatively movable in the horizontal direction with respect to the pile head, there is a method for supporting the structure by interposing an isolation bearing such as laminated rubber. Patent Document 1 described in the background section suggests that the laminated rubber resists the pulling force, but in the invention according to claim 3 of the present application, the pulling force is fixed to the outer periphery of the pile head. The anchor muscles to be resisted are structured so that an excessive pulling force does not act on the laminated rubber.

本願発明によれば、地震時における水平力に対する杭頭部の固定度を低減することで、せん断力や曲げモーメントによる杭頭部の破壊を防止することができ、かつ杭頭部の外周に固定したアンカー筋により引抜き力に対抗し、構造物の転倒や浮き上がりを防止することができる。   According to the present invention, by reducing the fixing degree of the pile head with respect to the horizontal force at the time of an earthquake, it is possible to prevent the pile head from being destroyed by a shearing force or a bending moment, and to fix the pile head to the outer periphery of the pile head. The anchor muscles against the pulling force can prevent the structure from toppling or lifting.

図１は、本願発明の一実施形態における要部の概要を示したもので、基礎杭としての節杭１の杭頭部上面と、上部構造体としてのフーチング５との間に縁切用の鋼板からなるプレート６を介在させることで、節杭１の杭頭部とフーチング５が水平方向に相対移動可能となっている。   FIG. 1 shows an outline of a main part in one embodiment of the present invention, and is used for edge cutting between a pile head upper surface of a joint pile 1 as a foundation pile and a footing 5 as an upper structure. By interposing the plate 6 made of a steel plate, the pile head of the joint pile 1 and the footing 5 can be relatively moved in the horizontal direction.

プレート６はフーチング５側の下面に固定されており、図示した実施例では外周部に下向きに突出する壁を有する箱形とし、杭頭部をその範囲内で水平移動可能としているが、平板でもかまわない。   The plate 6 is fixed to the lower surface of the footing 5 side. In the illustrated embodiment, the plate 6 has a box shape having a wall protruding downward on the outer peripheral portion, and the pile head can be moved horizontally within the range. It doesn't matter.

また、節杭１の杭頭部については、その外周部である節部１ｂの直下にあらかじめ周方向に複数本のアンカー筋３を取り付けたバンド状接合具２を固定し、フーチング５側のプレート６を貫通させてアンカー筋３をフーチング５のコンクリート５ａ内に定着させてある。   Moreover, about the pile head part of the joint pile 1, the band-shaped connector 2 which attached the multiple anchor bars 3 to the circumferential direction in advance directly under the joint part 1b which is the outer periphery is fixed, and the plate by the side of the footing 5 is obtained. 6, the anchor bars 3 are fixed in the concrete 5 a of the footing 5.

この例で、バンド状接合具２は、リングを２分割した形状を有し、端部どうしを突き合わせてボルト４で締め付けている。   In this example, the band-shaped connector 2 has a shape obtained by dividing the ring into two parts, and the ends are brought into contact with each other and fastened with bolts 4.

図２は、この杭頭接合構造の作用の説明図である。すわなち、図２(a) のように、プレート６を介して杭頭部（節杭１の頭部）と上部構造体（フーチング５）とが水平方向に相対移動可能となっていることで、杭頭部で上部構造体の鉛直荷重を支持しつつ、地震時の水平力の杭頭部への伝達が低減される。   Drawing 2 is an explanatory view of an operation of this pile head junction structure. That is, as shown in FIG. 2 (a), the pile head (head of the joint pile 1) and the upper structure (footing 5) can be relatively moved in the horizontal direction via the plate 6. Thus, the transmission of horizontal force to the pile head during an earthquake is reduced while supporting the vertical load of the upper structure at the pile head.

また、図２(b) のように、杭頭部（節杭１の頭部）に接合具２により取り付けられたアンカー筋３の上部が、上部構造体（フーチング５）に定着されていることで、鉛直方向に発生する引抜き力を杭に伝達することができる。   Moreover, as shown in FIG. 2 (b), the upper part of the anchor muscle 3 attached to the pile head (the head of the joint pile 1) by the connector 2 is fixed to the upper structure (footing 5). Thus, the pulling force generated in the vertical direction can be transmitted to the pile.

図３〜図４は、本願発明の杭頭接合構造の変形例を示したものである。 3 to 4 show modified examples of the pile head joint structure of the present invention.

図３は、節杭１の杭頭部を球形状として、フーチング５の下面のプレート６も曲面とすることで、球面座状の接触面を形成している。   In FIG. 3, the pile head of the joint pile 1 has a spherical shape, and the plate 6 on the lower surface of the footing 5 has a curved surface, thereby forming a spherical seat-like contact surface.

この場合、水平方向の相対移動に加え、回転が可能であり、また球面であるため地震後の原位置への復帰がスムースとなる。 In this case, in addition to the horizontal movement relative rotation is possible and reversion ing and smooth to the original position after the earthquake for a spherical surface.

図４は、杭頭部に積層ゴム８を介在させ、杭頭部の滑りではなく、積層ゴム８の水平ばねとしての水平変形性能により、杭頭部と上部構造体とが水平方向に水平移動可能となるようにしたものである。 FIG. 4 shows that the laminated rubber 8 is interposed in the pile head, and the pile head and the upper structure are horizontally moved by the horizontal deformation performance as a horizontal spring of the laminated rubber 8 instead of the sliding of the pile head. It was made possible.

図５は、本願発明の施工時における縁切用のプレートの取付け方法の一例したもので、地盤中に打設した節杭１の杭頭部に、アンカー筋３を取り付けたバンド状接合具２を固定し、そのアンカー筋３に縁切用プレート６を通している状態である。 FIG. 5 shows an example of a method for attaching the edge-cutting plate at the time of construction according to the present invention . The band-like connector 2 in which the anchor bars 3 are attached to the pile heads of the joint piles 1 placed in the ground. Is fixed and the edge cutting plate 6 is passed through the anchor muscle 3.

この場合、あらかじめ縁切用プレート６にアンカー筋３を貫通させるための貫通孔を設けておき、その貫通孔にアンカー筋３を通しながら、縁切用プレート６を節杭の杭頭部上端に設置する位置まで降ろす。上部構造体のフーチングなどの型枠が組まれた状態でコンクリートを打設することにより、縁切用プレート６はフーチング等のコンクリートと一体化し、アンカー筋３の上部はコンクリート中に定着される。   In this case, a through hole for penetrating the anchor bar 3 in advance is provided in the edge cutting plate 6, and the edge cutting plate 6 is placed on the upper end of the pile head of the joint pile while passing the anchor bar 3 through the through hole. Lower to the installation position. By placing concrete in a state where a formwork such as footing of the upper structure is assembled, the edge cutting plate 6 is integrated with the concrete such as footing, and the upper part of the anchor bar 3 is fixed in the concrete.

このような手順で組立てを行えば、アンカー筋３および縁切用プレート６が相互に位置決めの機能を有し、杭頭部に対する縁切用プレート６の位置決め作業も簡単である。   If the assembly is performed in such a procedure, the anchor bars 3 and the edge cutting plate 6 have a function of positioning each other, and the positioning work of the edge cutting plate 6 with respect to the pile head is also easy.

その他、必要に応じ縁切用プレート６の上面にシアーコネクターを設けるなどして、縁切用プレート６とフーチング等との一体化を高めることができる。   In addition, integration of the edge cutting plate 6 and the footing can be enhanced by providing a shear connector on the upper surface of the edge cutting plate 6 as necessary.

なお、図５の方法は一例を示しただけであり、本願発明の杭頭接合構造の施工手順はこれに限定されるものではない。 In addition, the method of FIG. 5 only showed an example, and the construction procedure of the pile head junction structure of this invention is not limited to this.

本願発明の一実施形態における要部の概要を示す断面図である。It is sectional drawing which shows the outline | summary of the principal part in one Embodiment of this invention. 本願発明の作用の説明図である。It is explanatory drawing of an effect | action of this invention. 本願発明の変形例を示す概要図である。It is a schematic diagram which shows the modification of this invention. 本願発明の他の変形例を示す概要図である。 Ru Summary view showing another modification of the present invention. 本願発明の施工時における縁切用のプレートの取付けの様子を示す斜視図である。It is a perspective view showing a state of mounting the plate rim switching during construction of the present gun invention. 従来例としての特許文献１に記載されている杭頭接合部の断面図である。It is sectional drawing of the pile head junction part described in patent document 1 as a prior art example. 従来例としての特許文献２に記載されている杭頭接合部の断面図である。It is sectional drawing of the pile head junction part described in patent document 2 as a prior art example.

符号の説明Explanation of symbols

１…節杭、１ａ…軸部、１ｂ…節部、２…バンド状接合具、２ａ…フランジ部、３…アンカー筋、４…ボルト、５…フーチング、５ａ…コンクリート、６…プレート、７…杭、８…積層ゴム支承、９…地盤 DESCRIPTION OF SYMBOLS 1 ... Node pile, 1a ... Shaft part, 1b ... Node part, 2 ... Band-shaped connector, 2a ... Flange part, 3 ... Anchor reinforcement, 4 ... Bolt, 5 ... Footing, 5a ... Concrete, 6 ... Plate, 7 ... Pile, 8 ... Laminated rubber bearing, 9 ... Ground

Claims (3)

基礎杭としての節杭の杭頭部と上部構造体との接合構造において、前記上部構造体を支持する基礎杭の杭頭部と上部構造体とを、該杭頭部の上面と上部構造体の下面との間に縁切用のプレートを介在させることで、水平方向に相対移動可能とし、かつ前記杭頭部の外周部である節部の直下の外周面に、あらかじめ周方向に複数本のアンカー筋を取り付けたバンド状接合具を締め付け固定し、該バンド状接合具に取り付けられた複数本のアンカー筋の先端部を、前記縁切用のプレートを貫通させて、前記上部構造体のコンクリート中に定着させてあることを特徴とする杭頭接合構造。 In the joint structure of the pile head of the joint pile as the foundation pile and the upper structure, the pile head and the upper structure of the foundation pile supporting the upper structure are connected to the upper surface and the upper structure of the pile head. By interposing an edge-cutting plate with the lower surface of the pile, it is possible to relatively move in the horizontal direction, and a plurality of circumferentially-directed outer circumferential surfaces are provided in advance on the outer circumferential surface directly below the node portion that is the outer circumferential portion of the pile head. The band-shaped connector to which the anchor muscles are attached is tightened and fixed, and the distal ends of a plurality of anchor muscles attached to the band-shaped joint are passed through the edge cutting plate to Pile head joint structure characterized by being fixed in concrete. 前記複数本のアンカー筋の前記縁切用のプレートの貫通位置を、前記節杭の節部の外周位置より外側としてあることを特徴とする請求項１記載の杭頭接合構造。The pile head joint structure according to claim 1, wherein a penetrating position of the edge-cutting plate of the plurality of anchor bars is located outside an outer peripheral position of a joint portion of the joint pile. 基礎杭としての節杭の杭頭部と上部構造体との接合構造において、前記上部構造体を支持する基礎杭の杭頭部と上部構造体とを、該杭頭部の上面と上部構造体の下面との間に免震支承を介在させることで、水平方向に相対移動可能とし、かつ前記杭頭部の外周部である節部の直下の外周面に、あらかじめ周方向に複数本のアンカー筋を取り付けたバンド状接合具を締め付け固定し、該バンド状接合具に取り付けられた複数本のアンカー筋の先端部を、前記上部構造体のコンクリート中に定着させてあることを特徴とする杭頭接合構造。 In the joint structure of the pile head of the joint pile as the foundation pile and the upper structure, the pile head and the upper structure of the foundation pile supporting the upper structure are connected to the upper surface and the upper structure of the pile head. By interposing a base-isolated bearing with the lower surface of the pile, it is possible to move in the horizontal direction, and a plurality of anchors in the circumferential direction in advance are provided on the outer circumferential surface directly below the node that is the outer circumferential portion of the pile head. muscle fixed tighten the band-shaped connectors attached to, characterized in that the front end portion of the plurality of anchors muscle attached to the band-shaped connectors, are allowed to settle in the concrete of the upper structure piles Head joint structure.
JP2003396109A 2003-11-26 2003-11-26 Pile head joint structure Expired - Lifetime JP4313164B2 (en)

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JP5200925B2 (en) * 2008-12-26 2013-06-05 株式会社大林組 Construction method of prestressed concrete structure
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